Commit | Line | Data |
---|---|---|
3c73a036 VY |
1 | /* |
2 | * IPv6 library code, needed by static components when full IPv6 support is | |
3 | * not configured or static. These functions are needed by GSO/GRO implementation. | |
4 | */ | |
5 | #include <linux/export.h> | |
6 | #include <net/ipv6.h> | |
7 | #include <net/ip6_fib.h> | |
3ce9b35f | 8 | #include <net/addrconf.h> |
6dfac5c3 | 9 | #include <net/secure_seq.h> |
3c73a036 | 10 | |
3c73a036 VY |
11 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) |
12 | { | |
13 | u16 offset = sizeof(struct ipv6hdr); | |
14 | struct ipv6_opt_hdr *exthdr = | |
15 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
29a3cad5 SH |
16 | unsigned int packet_len = skb_tail_pointer(skb) - |
17 | skb_network_header(skb); | |
3c73a036 VY |
18 | int found_rhdr = 0; |
19 | *nexthdr = &ipv6_hdr(skb)->nexthdr; | |
20 | ||
21 | while (offset + 1 <= packet_len) { | |
22 | ||
23 | switch (**nexthdr) { | |
24 | ||
25 | case NEXTHDR_HOP: | |
26 | break; | |
27 | case NEXTHDR_ROUTING: | |
28 | found_rhdr = 1; | |
29 | break; | |
30 | case NEXTHDR_DEST: | |
31 | #if IS_ENABLED(CONFIG_IPV6_MIP6) | |
32 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) | |
33 | break; | |
34 | #endif | |
35 | if (found_rhdr) | |
36 | return offset; | |
37 | break; | |
67ba4152 | 38 | default: |
3c73a036 VY |
39 | return offset; |
40 | } | |
41 | ||
42 | offset += ipv6_optlen(exthdr); | |
43 | *nexthdr = &exthdr->nexthdr; | |
44 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + | |
45 | offset); | |
46 | } | |
47 | ||
48 | return offset; | |
49 | } | |
50 | EXPORT_SYMBOL(ip6_find_1stfragopt); | |
3ce9b35f CW |
51 | |
52 | #if IS_ENABLED(CONFIG_IPV6) | |
53 | int ip6_dst_hoplimit(struct dst_entry *dst) | |
54 | { | |
55 | int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); | |
56 | if (hoplimit == 0) { | |
57 | struct net_device *dev = dst->dev; | |
58 | struct inet6_dev *idev; | |
59 | ||
60 | rcu_read_lock(); | |
61 | idev = __in6_dev_get(dev); | |
62 | if (idev) | |
63 | hoplimit = idev->cnf.hop_limit; | |
64 | else | |
65 | hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit; | |
66 | rcu_read_unlock(); | |
67 | } | |
68 | return hoplimit; | |
69 | } | |
70 | EXPORT_SYMBOL(ip6_dst_hoplimit); | |
71 | #endif | |
788787b5 CW |
72 | |
73 | int __ip6_local_out(struct sk_buff *skb) | |
74 | { | |
75 | int len; | |
76 | ||
77 | len = skb->len - sizeof(struct ipv6hdr); | |
78 | if (len > IPV6_MAXPLEN) | |
79 | len = 0; | |
80 | ipv6_hdr(skb)->payload_len = htons(len); | |
f6c20c59 | 81 | IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr); |
788787b5 CW |
82 | |
83 | return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, | |
84 | skb_dst(skb)->dev, dst_output); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(__ip6_local_out); | |
87 | ||
88 | int ip6_local_out(struct sk_buff *skb) | |
89 | { | |
90 | int err; | |
91 | ||
92 | err = __ip6_local_out(skb); | |
93 | if (likely(err == 1)) | |
94 | err = dst_output(skb); | |
95 | ||
96 | return err; | |
97 | } | |
98 | EXPORT_SYMBOL_GPL(ip6_local_out); |